Por favor, use este identificador para citar o enlazar este ítem: http://repositoriodigital.ipn.mx/handle/123456789/11163
Título : Porous framework of T2[Fe(CN)6] xH2O with T ¼ Co, Ni, Cu, Zn, and H2 storage
Palabras clave : Crystal chemistry
Prussian blue
Hydrogen storage
Structural studies
Fecha de publicación : 16-ene-2013
Editorial : Journal of Solid State Chemistry
Descripción : The materials under study were prepared from aqueous solutions of ferrocyanic acid and salts of the involved transition metals and their crystal structure solved and refined from X-ray powder diffraction data. Complementary information from thermogravimetric, infrared and Mo¨ ssbauer data was also used for the structural study. Three different crystal structures were found: hexagonal (P-3) for Zn with the zinc atom coordinated to three N ends of CN groups plus a water molecule, cubic (Pm-3m) for Ni and Cu, and monoclinic (P21/m) for Co. For Ni and Cu the obtained solids have an open channel framework related to 50% of vacancies for the building unit, [Fe(CN)6]. In the as-synthesized material the framework free volume is occupied by coordinated and hydrogen-bonded water molecules. These of hexacyanoferrates (II) have received certain attention as prototype of materials for the hydrogen storage. In the anhydrous phase of Ni and Cu, 50% of the metal (T) coordination sites, located at the cavities surface, will be available to interact with the hydrogen molecule. However, when the crystal waters are removed the porous frameworks collapse as it is suggested by H2 and CO2 adsorption data. For Co, a structure of stacked layers was found where the cobalt atoms have both tetrahedral and octahedral coordination. The layers remain together through a network of hydrogen-bonding interactions between coordinated and weakly bonded water molecules. No H2 adsorption was observed in the anhydrous phase of Co. For Zn, the porous framework remains stable on the water removal but with a system of narrow channels and a small available volume, also inaccessible to H2. & 2008 Elsevier Inc. All rights reserved.
URI : http://www.repositoriodigital.ipn.mx/handle/123456789/11163
Otros identificadores : Journal of Solid State Chemistry 181 (2008) 2899–2907
Aparece en las colecciones: Doctorado

Ficheros en este ítem:
Fichero Descripción Tamaño Formato  
2008JSSC_T2Fe&H2 2.pdf83.3 kBAdobe PDFVisualizar/Abrir

Los ítems de DSpace están protegidos por copyright, con todos los derechos reservados, a menos que se indique lo contrario.